#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>

int main(void)
{
    pid_t pid;
    printf("Before: pid is %d\n", getpid());
    if ((pid = fork()) == -1) {
        perror("fork()");
        exit(1);
    }
    printf("After: pid is %d, fork return %d\n", getpid(), pid);
    sleep(1);
    return 0;
}
